Imagine choosing a place for a group lunch. Your friend prefers a busy cafe; you need somewhere quiet enough to talk. Begin with the shared decision: "The cafe looks good, but I am concerned that it may be difficult to hear each other."
The concern is specific and relevant. "That is a bad choice" judges the option without explaining the problem, while "You never think about noise" changes a lunch discussion into criticism of the person.
Offer a practical next move
Try, "Could we use the quieter room at the back, or choose the smaller cafe nearby?" The suggestion gives the group something to evaluate. You can acknowledge another benefit: "I agree that the first place has more food choices."
Practice the other person's response too: "The back room is closed today." Update your proposal: "Then the smaller cafe might work, if everyone can find something to eat." Do not keep defending a plan after its important condition has changed.
Use the exercise for modest decisions such as meeting locations or study activities. More serious disputes may require different communication skills and support. Review whether you stated a preference, a factual constraint, or a guess. Clear disagreement helps people compare the actual needs rather than interpreting every different opinion as rejection of the person expressing it.